I am back with friend in French city (5)
I believe the answer is:
miami
'city' is the definition.
(Miami is an example)
'i am back with friend in french' is the wordplay.
'i am' becomes 'I'm' (contraction).
'back' says the letters should be written backwards.
'with' says to put letters next to each other.
'friend in french' becomes 'ami' (I've seen this in another clue).
'im' backwards is 'mi'.
'mi'+'ami'='MIAMI'
(Other definitions for miami that I've seen before include "Popular sun-city of Florida" , "Florida resort city, Beach" , "place associated with vice?" , "Resort city in SE Florida" , "US city" .)